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HDAC Status 2004: Observations, Sensitivity Changes, and Modulation Analysis

This document provides an overview of HDAC's status in 2004, including observations, sensitivity changes, and modulation analysis. The data sets and measurements are analyzed to understand the modulation modes and potential causes of sensitivity changes. Open problems and next steps for optimizing HDAC performance are also discussed.

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HDAC Status 2004: Observations, Sensitivity Changes, and Modulation Analysis

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  1. HDAC: 2004

  2. HDAC Status 2004: • ~450 data sets in Jun. 2004 • ~2700 data sets in Jan. 2005 • HDAC run in photometer mode most of the time, slow sensitivity decrese, • 9 modulation measurements, switching filaments • Important observations in 2004: • LISM modulation, switching filaments • Phoebe, Titan, Saturn, … • “Systemscans”

  3. HDAC Status: • Radiometry • Small sensitivity changes over the whole year 2003/4 • Hot Model fits data • Sensitivity is about 50 c/s/R

  4. HDAC Status: • Radiometry • Analysed data from IPHSURVEY sequences • Looking for data, which are constant within a sequence

  5. HDAC absolute sensitivity: HDAC sensitivity 2002 (no break-ins)

  6. HDAC absolute sensitivity: absolute sensitivity stabilized ... ~ 60 counts/sec/R

  7. HDAC Status: • Radiometry • Analysed data from IPHSURVEY sequences • Data, which are constant within the sequence • Analysed the variance / mean value – relation • n … number of incoming photons • m … measured value • µ … “Sensitivity”

  8. HDAC Status: • Radiometry • Analysed the variance / mean value – relation

  9. HDAC Status: • Radiometry • Analysed the variance / mean value – relation

  10. HDAC Status 2003:

  11. HDAC Status 2004:

  12. HDAC Status 2004:

  13. HDAC Status: • Radiometry • HDAC Sensitivity from FUV data (IPHSURVEY)

  14. HDAC Status: • Radiometry (see: HK_EVAL_NEW.PRO) • Analysed the variance / mean value – relation • Decrease of variance / mean value of 75% every year • Overall HotModel factor • 2003 – 63 • 2004 – 53 • Additional model inputs from sun exitation changes • Open problems: • Absolute sensitivity change in comparison to FUV • (FUV, absolute spectral response)

  15. Modulation mode: • H and D-Cell Modulation lower than expected • Shape of the modulation curve is different Derived a new Power-Tau-relation from all existing measurements • Results: • Describes all measurements • Stable situation for the last 3 years • Possible reasons: • Loss of Hydrogen and/or change of dissociation rate • Filament or wall dependent

  16. HDAC modulation analysis: Results: no differences using the filaments 2 instead of filaments 1 The additional signal by switching on the D cell is still there Decided to switch back to filaments 1

  17. 2004-030T01:54:56.0 192.307 -79.1874 -2.08658 8.57658 -0.0508378 2004-059T01:51:32.0 37.0632 76.4367 -2.18278 8.59764 -0.0500043

  18. HDAC modulation analysis: 7 * HDAC conditioning in 2004 2004-114T02:51:30.49500 2004-136T19:00:36.71475 2004-138T11:24:36.76589 2004-140T18:47:42.46509 2004-157T17:46:41.90646 2004-184T12:22:41.81400 2004-318T08:25:36.37405

  19. HDAC modulation: • New program for HDAC modulation analysis • Integrates HotModel & Spice

  20. HDAC modulation: • New program for HDAC modulation analysis • Integrates HotModel & Spice • Next steps: • Optimizing parameters • Accuracy estimation • sEstm = 0.0379 A • sLISM = 0.0391 A • Diff  1 mA • (1215.664 A, 1215.34 A)

  21. HDAC modulation analysis: Modulation analysis only works for H-modulation Problem: Influence of the D-Cell (radiation of D-filament) Between 20% & 30%

  22. HDAC modulation analysis: Modulation analysis only works for H-modulation Problem: Influence of the D-Cell (radiation of D-filament) Between 20% & 30% Sometimes there is no additional Signal Result: See Result.xls

  23. HDAC modulation: Korrekturversuch [1d2, 2d2, 5d2, 5d2, 9d2, 22d2, 26d2, 33d2]

  24. HDAC modulation: Korrekturversuch [1d2, 2d2, 5d2, 5d2, 9d2, 22d2, 26d2, 33d2]

  25. HDAC modulation: Temperaturrekonstruktion Funktioniert oft nicht! [1d2, 2d2, 5d2, 5d2, 9d2, 22d2, 26d2, 33d2]

  26. HDAC modulation analysis: HDAC modulation measurements during the other Titan observations until end of mission Need to compare the HDAC data with FUV data (HDAC's red tail sensitivity)

  27. Titan: 2005-12-26T18 Problem: New tour kernel Old pointing

  28. Titan: 2006-10-25T15 2006-12-12T11 2006-12-28T10 2007-01-29T07 2007-08-31T06 2008-05-28T08

  29. Titan Modulation Data 2004-184T 2005-090T08

  30. Titan Limb Measurements

  31. Titan Off-Axis Response

  32. Titan Limb Scan

  33. Titan Limb Scan Ergebnis

  34. Data Analysis: • Phoebe

  35. Data Analysis: • Phoebe

  36. Data Analysis: • Phoebe • FUV-Data HDAC spectral sensitivity

  37. HDAC Events: TITAN Dist = 110.000 km Phase Angle = 1° MV  26 kc MV  450 R (?)

  38. HDAC Events: SATURN Dist = 324.937 km Phase Angle =9.3° MW  50 kc MW  900 R (?)

  39. HDAC Events: SATURN System Scan

  40. HDAC Open Problems for 2005: • Absolute sensitivity and comparison to FUV • FUV Data handling (more or less solved) • Applying sensitivity from Bill • Long time investigation of HDAC - Sensitivity • Saturn – Orbit System Scan • Saturn – Limb(?) san • Find out Orbit-situation • Titan Limb-Scan • Titan Modulation

  41. HDAC Open Problems for 2005: • SATURN • Absolute sensitivity and comparison to FUV • FUV Data handling (more or less solved) • Applying sensitivity from Bill • Long time investigation of HDAC - Sensitivity • Saturn – Orbit System Scan • Find out Orbit-situation • Titan Limb-Scan • Titan Modulation

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